:bug: fix depotprice variable (number not table)

[Sanriku-Gaming]

Describe Pull request Fix for Bug #321 https://github.com/qbcore-framework/qb-garages/issues/321

I have not personally tested this, but I assisted someone with this error and this was the resolution,

Questions (please complete the following information):

• Have you personally loaded this code into an updated qbcore project and checked all it's functionality? [no] (Be honest)
• Does your code fit the style guidelines? [yes]
• Does your PR fit the contribution guidelines? [yes]